The package was addressed to Taylor's room number in the Capitol, though it did not include her name. The return address said "Milwaukee trade unions want the iron mine," a reference to a bill to streamline iron ore mining regulations that failed last week after Taylor and others opposed the measure.

Peterson said the mailroom alerted Tyalor's office to the package and he got the Capitol Police involved. Peterson said he believed it was human excrement.

Here's the outside of the package:

About Patrick Marley

Patrick Marley covers state government and state politics. He is the author, with Journal Sentinel reporter Jason Stein, of "More Than They Bargained For: Scott Walker, Unions and the Fight for Wisconsin.”